Pitman



(No Model.)

J. A. McANULTY.

PITMAN.

No. 394,280. Patented Dec. 11, 1888.

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UNITED STATES PATENT OFFICE.

JOHN A. HCANULT Y, OF MINNEAPOLIS, MINNESOTA.

PITMAN.

SPECIFICATION forming part of Letters Patent No. 394,280, dated.December 11, 1888.

Application filed March 26, 1888. Serial No. 268,547. (No model.)

To all whom it may concern.-

Be it known that I, JOHN A. MCANULTY, a citizen of the United States,residing at Minneapolis, in the county of llennepin and State ofl\linnesota, have invented certain new and useful Improvements inIitmen; and I do hereby declare the following to be a full, clear, andexact des('-ription of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to pitmen for connecting cranks or eccentrics,either revolving or rocking, to parts of n'lachincry which are designedto be reciprocated; and it consists in the improved construction andarrai'lgement or combination of parts of the pitman and its connections,which will be hereinafter fully disclosed in the description, drawings,and claims.

The objects of my invention are, first, to provide improved means forvibrating or re ciprocating parts of machinery, and, second, to provideimproved means for attaching pit men to eccentrics, eccentric shafts orcranks in such a manner that rattling and heating of boxes will beprevented and free play allowed to the parts vibrated or reciprocatedwithout binding or unequal wear upon said eccentrics, eccentric shaftsor cranks.

In the accompanying drawings, formin part of this specification, whereinthe same reference-numerals indicate the same or corresponding parts,Figure 1 represents a side view of the pitman in section, showing it attached to a coupling adapted to be secured to a vibrating orreciprocating part supported in a plane in line with the shaft, thelatter being shown in section; l ig. 2, a similar view showing thepitman attached to a coupling adapted to be secured to a reciprocating0r vibrating part supported in a plane below that of the shaft; and Fig.3, a top plan view showing the various positions which the pitman mayassume in dotted lines.

In the drawings, the numeral 1 indicates the shaft, having a crank or aneccentric, 2,

' which may be formed by reducin the shaft,

as shown in the drawings, or by attaching an eccentric of larger radiusthan the shaft, or in any of the WGll-lUlOWIl ways of forming cranks oreccentrics.

The cylindrical box 3, as shown in section in Figs. l and 2, is formedin two parts and so fitted upon the eccentric as to permit the latter tomove or revolvefrcel v within it; also, the upper part thereof may beprovided with an oil-cup, r, adaptwl to receive and distribute asuitable lubricant to the eccentric and throughout the interior of thebox. The two parts of the box have diamctrically-oppositc conicaldepressions 5, placed at an angle of about :torly-fivc degrees to theaxial line of the pitman and the plane of the mechanism to bereciprocated.

(3 represents the pitman, which is formed at its inner end with a curvedhead, 7, which passes around morethan half of the box,preferably beneaththe same. A point or pivot, 8, is formed upon the inner side of thiscurved head, and is so fitted into the depression 5 in the lower part ofthe box as to pivot freely therein laterally; also, the extreme end ofthis curved head is formed with a screw-threaded opening, 9, at a pointdiametrically opposite the point or pivot S. A set-screw, 9, which alsoacts as a pivot, passes through this opening and fits with its conicalend in the depression 5 in the upper part of the box. A bindingnut, 10,firmly holds the set-screw in its adjusted position. By tightening thisset-screw a perfect adjustment of the two-part box to its crank oreccentric is efiected and wear compensated for.

The outer end of the pitman or connectingrod (3, which is attached tothe object to be vibrated or reciprocated, is preferably bent at a rightangle to the remaining portion of said pitman, as at 1]., the end of thebent portion being formed with a ball, 12, which is adapted to fit in asuitable ball-andsocket joint or coupling, 13, attached to the part tobe vibrated or reciprocated, thus permit-ting said part to have auniversal movement about the ball of said pitman.

In Fig. 1 of the drz'uvings the outer end of the pitman is turned upwardand then curved downward, this form being used when the part to bereciproca-ted or vibrated is sup ported in plane with theeccentric-shaft; also, when said part is arranged in a plane above orbelow that of the shaft-an instance of it below being shown in Fig.2-said outer end of the pitman is bent at a right angle to its bodyportions, either upward or downward. These bends in the pitman cushionthe shock ordinarily incident to the reciprocating or vibrating framesemployed in various kinds of machinessuch middlingspurifiers,feed-regulators, and grain-cleanersespecially in those machines in whichthe parts moved are rapidly reciprocated. This cushioning or avoidanceof jar is due to: the spring or resiliency ol' the metal'forming thebends of the pitmen, which enables me to dispense with the springsordinarily employed for supporting shaking frames in machinesiof thekind just named.

It will be obvious from the foregoing that the ball-and-socket joint orcoupling forming the connection between the part reciprocated orvibrated and the pitman, together with the pivots arranged at an angleto the axial line of said pitman and forming the connection between theinner end of the pitman and the eccentric, will allow the part beingreciprocated to deviate from a line at right angles to the shaft, asshown in dotted lines in Fig. 3; that all irregularities in the motionof said reciprocating or vibrating part will be taken up or compensatedfor; that uneven wear upon the eccentric and the two-part boxing, due toheating from the binding or cramping and rapid movement of the parts, isentirely avoided, and also that rattling of the joints or couplings isprevented.

This construction of pitman is especially adapted to be used in machinesof the character above referred to for the treatment of grain or itsproducts in any form, since in that class of machines the principalparts require reciprocating or vibrating movement and cushioning, asthey are subjected to varying pressures or loads of stock; but, as isevident, my generally improved pitman, with its curved head pivoted tothe crank or eccentric at diametrically-opposite points, which arearranged at an angle to its axial line, may be employed in any mechanismin which a pitman is required to permit of lateral play.

I do not herein claim the combination of .an eccentric, a box mountedthereon, and a laterally-movable pitman provided with pivots at itsinner end arranged at an angle to its axial line, and provided near itsouter end with a spiral spring, which is lengthwise compressible andexpansible and laterally and vertically yielding or movable, as the sameforms part of a similar invention, for which I have filed applicationfor Letters Patent simultanously herewith, Serial No. 268,548; also, Ido not claim the combination of a crank -pin and a pitman connectedthereto by means of a ring, and a box within said ring which is pivotedupon two points that are coincident with the axis of said pitman, asthis construction does not permit of the wide range or freedom oflateral movement of the pitman employed by me and provided with pivotsarranged at an angle to the axial line thereof.

Having thus fully described the construction and operation of myinvention, what I claim as new r 1. The combination, with an eccentricand a box mounted thereon, of a laterally1novable pitman provided at itsinner end with pivots arranged at an angle to its axial line,substantially as and for the purpose described.

2. The combination, with an eccentric and a box mounted thereon, of alaterally-movable pitman provided at its inner end with pivots arrangedat an angle to its axial line, and having its outer end formed into anelastic or spring portion, substantially as and for the purposedescribed.

The combination,with an eccentric and a box mounted thereon, of alaterally-movable pitman provided at its inner end with pivots arrangedat an angle to its axial line, and having its outer end bent at a rightangle and formed into an elastic or spring portion, substantially as andfor the purpose described.

4. The combination, with a pitman formed with a curved head havingdiametrically-opposite pivots at its end and inner side, which arearranged at an angle to its axial line, of an eccentric, and a boxmounted thereon and formed with diam etrically-opposite depres sions inwhich said pivots fit, substantially as and for the purpose described.

5. The combination of an eccentric and a cylindrical box mounted thereonand provided with diametrically-opposite depressions,

which are arranged at an angle to the axis of said cccent.ric,with apitman having a curved head formed with a pivotal point on its innerside resting in one of said depressions and having a screw-threadedopening in its outer end, and a pointed set-screw having its end restingin the other depression, substantially as and for the purpose described.

6. The combination ofan eccentric and a two-part box mounted thereon,with a laterally-movable pitman provided with pivots arranged at anangle to its axial line, one of said pivots being a set-screw foradjusting said two part box and compensating for wear, substantially asand for the purpose described. 7

7. The combination of an eccentric shaft and a two-part box mountedthereon, with a laterally-movable pitman provided with pivots arrangedat an angle to its axial line, one of said pivots being a set'screw foradjusting said two-part box to compensate for wear, and a clampingnutfor holding said setscrew in. its adjusted posit-ion, substantially asdescribed. 7

8. The combination of an eccentric and a cylindrical box mounted thereonand provided with diametrically-opposite depressions in its sides,whichare arranged at an angle to the axial line of said crank or eccentric,with a laterally-movable pitman having a curved head provided withdiametrically-opposite pivots at its end and on its inner side, whichfit in said depressions, and formed at its outer end with a bent elasticor spring portion, substantially as described.

9. The combination of an eccentric, a box mounted thereon, and alaterally-movable pitinan provided with pivots at its inner end, andform ed at its outer end with a bent elastic or spring portion having aball at its end, with an object or part which is adapted to bereciprocated or vibrated, and which is provided with a ball-and-socketjoint or coup- IO ling, substantially as described.

In testimony whereof I aiiix my signature in presence of two witnesses.

JOHN A. MGANULTY.

Witnesses:

A. H. MCANULTY, A. 0. PAUL.

